About
OpenCelliD is the world’s largest open database of cell towers with a license CC BY-SA 4.0. Data has full world coverage and is freely available for download.
The tabular data has ~40 million rows and 6 columns in it but only 3 columns (latitude, longitude, and type) are used in this visualization.
Resource
– Source/Discussion: Visualization of 40M Cell Towers | Hacker News